Using arrays instead of hashes in MARC::Field constructor

Whenever you’re creating a MARC field using Perl’s excelent MARC::Field module, you can always use an array instead of a hash in order to specify subfield/data pairs. This is useful since some field/subfield combinations in MARC are repeatable, and the POD leads you to writing hashes for storing subfield/data pairs before creating the field. For example, the POD says: